石油与天然气地质
石油與天然氣地質
석유여천연기지질
OIL & GAS GEOLOGY
2015年
1期
73-79
,共7页
张永旺%曾溅辉%曲正阳%陈俊兵
張永旺%曾濺輝%麯正暘%陳俊兵
장영왕%증천휘%곡정양%진준병
自生高岭石%高岭石成因%砂岩储层%东营凹陷
自生高嶺石%高嶺石成因%砂巖儲層%東營凹陷
자생고령석%고령석성인%사암저층%동영요함
authigenic kaolinite%genesis of kaolinite%sandstone reservoir%Dongying Sag
通过大量薄片鉴定、岩心观察以及扫描电镜、粘土矿物粉晶衍射等分析测试手段,对东营凹陷砂岩储层中发育的高岭石的分布、产状以及镜下特征等进行了分析。结果表明,研究区砂岩储层中高岭石有自生和陆源两种成因。自生高岭石在储层中较为常见,其微观特征表现为结晶形态完整,呈典型的书页或蠕虫状充填于粒间孔和长石颗粒溶孔内,在铸体薄片中可见自生高岭石集合体呈“斑状”的聚集充填特征。陆源高岭石在研究区较为少见,一般在浅层出现,是在沉积过程中与碎屑颗粒等非粘土矿物同时形成。在上述研究的基础上,对自生高岭石成因机制进行了讨论,认为东营凹陷砂岩储层中长石类矿物的溶蚀作用是自生高岭石形成的主要物质来源。研究区粒度大、分选好的砂岩储层中高岭石含量较高,说明除酸性的流体环境和一定的物质供应外,流体动力条件也是自生高岭石形成的重要控制因素。
通過大量薄片鑒定、巖心觀察以及掃描電鏡、粘土礦物粉晶衍射等分析測試手段,對東營凹陷砂巖儲層中髮育的高嶺石的分佈、產狀以及鏡下特徵等進行瞭分析。結果錶明,研究區砂巖儲層中高嶺石有自生和陸源兩種成因。自生高嶺石在儲層中較為常見,其微觀特徵錶現為結晶形態完整,呈典型的書頁或蠕蟲狀充填于粒間孔和長石顆粒溶孔內,在鑄體薄片中可見自生高嶺石集閤體呈“斑狀”的聚集充填特徵。陸源高嶺石在研究區較為少見,一般在淺層齣現,是在沉積過程中與碎屑顆粒等非粘土礦物同時形成。在上述研究的基礎上,對自生高嶺石成因機製進行瞭討論,認為東營凹陷砂巖儲層中長石類礦物的溶蝕作用是自生高嶺石形成的主要物質來源。研究區粒度大、分選好的砂巖儲層中高嶺石含量較高,說明除痠性的流體環境和一定的物質供應外,流體動力條件也是自生高嶺石形成的重要控製因素。
통과대량박편감정、암심관찰이급소묘전경、점토광물분정연사등분석측시수단,대동영요함사암저층중발육적고령석적분포、산상이급경하특정등진행료분석。결과표명,연구구사암저층중고령석유자생화륙원량충성인。자생고령석재저층중교위상견,기미관특정표현위결정형태완정,정전형적서혈혹연충상충전우립간공화장석과립용공내,재주체박편중가견자생고령석집합체정“반상”적취집충전특정。륙원고령석재연구구교위소견,일반재천층출현,시재침적과정중여쇄설과립등비점토광물동시형성。재상술연구적기출상,대자생고령석성인궤제진행료토론,인위동영요함사암저층중장석류광물적용식작용시자생고령석형성적주요물질래원。연구구립도대、분선호적사암저층중고령석함량교고,설명제산성적류체배경화일정적물질공응외,류체동력조건야시자생고령석형성적중요공제인소。
Arthroscopic characteristics ,distribution and occurrence of kaolinite are analyzed through quantity thin section analysis ,core observation ,scanning electron microscope and X-ray powder diffraction .The results show that the kaolinite of sandstone reservoirs in Dongying Sag has two genetic types including authigenic kaolinite and terrigenous kaolinite .The authigenic kaolinites are common in the reservoirs .Microscopically ,they show complete crystal form ,and fill intergranular pores and dissolution pores of feldspar in typical sheet or vermicular shapes .The “spotted” filling feature of the authit-genic kaolinite aggregates are clear on cast thin sections .The terrigenous kaolinites are rare and often occur in shallow layers .They are formed in association with the non-clay minerals like clastic particles in deposition process .Based on the study mentioned above ,the genetic mechanism of authigenic kaolinite is discussed .It is supposed that feldspar dissolution is the main material source for the formation of authigenic kaolinite .Sandstones with large grain size and well sorting have high content of kaolinite ,indicating that ,in addition to acid fluid environment and sufficient material supply ,strong fluid dynamic is also an important controlling factor of authigenic kaolinite formation .